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Test Details

  • Sugar Test
  • Glucose
  • Fasting
  • Plasma


A blood glucose test measures the amount of glucose in blood taken after overnight Fasting Condition.

More about Fasting Blood Sugar

Other names: FBS test, Fasting blood glucose, Blood sugar


The fasting blood sugar test measures the amount of blood sugar after 12 hours of overnight fasting.

The food we eat is converted to glucose and the level of glucose in the blood is controlled by insulin. In a diabetic person, either there is not enough insulin produced or there is insulin impairment. An overnight fasting result helps your doctor understand the baseline level. It is also important to remember that blood sugar levels will also elevate in trauma, after surgery, during illness, steroid medications, etc.

Why fasting blood sugar test?

Fasting blood sugar test provides more accurate results and is easy to interpret.

India is home to over 77 million diabetics and has the second-highest number of diabetes patients aged between 20-79 years as of 2019. Socioeconomic and demographic changes, along with increased susceptibility for diabetes in India individuals owing to genetic factors have led to an explosive rise in the prevalence of diabetes mellitus in India over the past forty years.

In addition, the country also has a burden of ‘’pre-diabetes’’. Timely diagnosis can prevent pre-diabetes manifesting in to diabetes. Good sugar control in diabetics can also help prevent diabetes related complications.

Thus, the focus in on prevention for non-diabetic and pre-diabetic people and in those who are diagnosed with diabetes, it is important to monitor blood sugar levels regularly. Diabetes is associated with a number of serious complications that lead to hospitalization, morbidity and even premature deaths in diabetic patients.

Who should get testet for Fasting Blood Sugar test?
  • Your healthcare provider may order this test as part of routine diagnostics in case of illness or if diabetes is suspected. Symptoms include frequent urination, unusual thirst, blurred vision, wounds that take long time to heal, sweating, fatigue, hunger, unusual craving for sweets, tiredness, repeated infections and sores.
  • Blood sugar tests are often ordered during recovery – especially in the POST COVID world, those who are recovering from COVID or have recently recovered from COVID are advised to keep a tab on their blood sugar levels.
  • Diagnose pre-diabetes: India faces a huge burden of pre-diabetes therefore measuring blood sugar levels regularly can help one assess if they are pre-diabetic. Lifestyle changes can help you prevent diabetes or cardiovascular disease
  • Diagnose type 1 and type 2 diabetes: Fasting blood sugar test is also used to diagnose diabetes along with fasting or random blood sugar levels

Monitor blood sugar levels: Once you are diagnosed with diabetes, it is important to ensure that the blood sugar levels are always under control and that your treatment is going as planned

Reference Values for Fasting Blood Sugar test
Fasting Blood sugar value in mg/dL What does the value mean?
74 – 99 Normal
100 – 125 Pre-diabetes
> 126 Diabetes


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